doiSerbia

Nonisothermal desorption of droplets of complex compositions

Nakoryakov Vladimir E. (Institute of Thermophysics Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia)
Misyura Sergey Ya (Institute of Thermophysics Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia)
Elistratov Sergey L. (Institute of Thermophysics Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia)

This paper presents the process of nonstationary evaporation of aqueous solutions of LiBr-H2O, CaCl2-H2O, NaCl-H2O droplets on a horizontal heating surface. The following typical stages of heat and mass transfer depending on wall temperature have been considered: evaporation below boiling temperature and nucleate boiling. The significant decrease in desorption intensity with a rise of initial mass concentration of salt has been observed. Formation of a surface crystallization front at evaporation of a droplet has been detected. We have developed the experimental method for direct measurements of the mass of evaporating droplet.

Keywords: droplets nonstationary evaporation, aqueous salt solutions, desorption, heating surface